After using *choices and *ifs you have to finish with a *goto, so that the code knows where to go after it reaches that point.
The *gotos go to *label of a name you can define.
*choice
#Male
Ok.
*set gender male
*page_break
*goto afterGender
#Female
Ok.
*set gender female
*page_break
*goto afterGender
*label afterGender
Continue your game here...
Alternatively you can use *fake_choice, which doesn’t require a *goto at the end, and it will simply continue down when it finishes the choice code.
Also use this program to make coding easier, as well as handling indenting.