For the signature Click on your name then you should get a list in that list it should say signature (second one on the left) click on that and you should get a box open up, then write what you need and click save
I don't recall having any problems with creating a signature but then it was a few days before I found my current sig. Welcome to Gardeners Corner, @LunarSea . I was never on Gardeners Would forum but it seems that many were unhappy there & moved here at some point. Looking forward to seeing some pictures of your work in the coming months. .