Affix is used to create pairs of short mathematical problems or short text tasks, where students have to find the other half of the pair from the floating answer options.
To create a unit, navigate to For teachers - Learning units page, click Create new, and choose a unit type. To edit an existing unit, navigate to For teachers - Learning units page, find the learning unit in the list, and click the Edit button 
.
On the Affix learning unit's edit screen you have the following fields for settings and unit content:
- Unit name - This name will be displayed in the lists of units.
- Labels - Create text labels, which describe the unit's content, purpose, target group, keywords, etc. Labels with multiple words and labels shorter than 3 characters are not supported.
- Advanced settings
- Score value - The points given after successfully completing the task.
- Correct answers required to complete the task (in %) - The percentage of correct answers required to successfully complete the task. If you have one question, the value should be the default 100%, but if you have more questions, more task screens, you can set any percentage of required correct answers.
- Task difficulty (label) - Select difficulty of the unit, which will be added as a label to the learning unit.
- Edit math formulas with Latex - This setting enables the use of a latex editor for creating math formulas.
- Task screen - This type of learning unit can contain multiple task screens. One task screen can contain multiple pairs (ideally 4-6). To add a new task screen, click the Add new task screen button below the actual task screen. During play, a new task screen appears after completing the tasks on the actual screen.
- Response time (minutes) - The time a student can spend on completing the given task screen.
- Instruction/question - Instruction for the task or a question to answer.
- Statement - Statements are the fixed items, to which the students must find the second part or the pair of them. They are displayed on the left side of the play screen. You can add latex
to this field. To add a new statement-correct answer pair, click the Add statement button. - Correct answer - On the editor screen, next to the Statement, you have to enter the correct answer (the second part of the statement or the pair of it). These answers will be floating on the right side of the play screen. You can add a latex to this field. To add a new statement-correct answer pair, click the Add statement button.
- Wrong answer - You can add wrong answer options too, which will be floating along with the correct answers on the right side of the play screen. You can add a latex to this field. To add a new wrong answer option, click the Add wrong answer button.
- Enable info window - By enabling info window you can add an additional help text to the unit, which can be displayed by clicking on the Info button that appears on the unit's play screen. By enabling this setting, you can add a text, an image
or a latex to the Info window text field.
- Convert learning unit to a superunit (add helping units) - see chapter Superunits
To check the unit's playable version, click the Save then the Preview button. After you finish editing, click the Save and exit button. This closes the editor screen and gets you back to the unit's list screen.