question

Olivia • Sassy not trashy 🦄
okay so how do I join the group after someone has added me? I'll push the little button on my notification that says 'check it out' and it'll just say reply but I can't send anything. and then I'll go up to the little + button on my groups at the very top to try to see it but it's still not there. so does anyone know how you do it?