Hello @johann.ouaki,
- Start a workflow by selecting the checkbox … then right clicking … and selecting start/edit workflow
- Create 2 workflows with your chosen actions. One for condition checked and a second one for condition not checked (this way you deal with both possible scenarios of the checkbox being checked … or not … everytime the user clicks on it).
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You can use custom states to house the value of the choice. If you do not know how to use custom states, perhaps you can research on youtube, this forum, etc etc … how they work. A good walkthrough is this one > Custom States | Bubble.io Tutorial
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Use the custom state’s value in your workflow action to set the value of the user field’s gender. Best way for now until you are more familiar with database models is to make the gender of type text. Later on you can explore option sets. This is a good video to learn how the function.
Best of luck with your app! 