Generally "tagalongs" are not allowed a Girl Scout meetings and programs. We do however occasionally offer programs where they are welcome to attend - for instance Solar Bears, Orlando Soccer and other sporting events. If tagalongs are invited it will say in the registration description on our website.
If the program allows tagalongs there will be a box on the registration page that says "Add Additional People". Click that box and you will be asked for the additional information needed. If you don't see that box it is because the event is designed for girls only and tagalongs are not invited.