Xiomalis, at the top of the page, next to where you would log out of SidCity, click on
My Controls. Once there, scroll down to where it says
Personal Profile and you will see "Edit Signature" and "Edit Avatar Settings". In "Edit Avatar Settings", you will see "Base Gallery". Click on the button and it will take you into the avatar gallery for you to choose one that you like. Once you have chosen one, just click the little circle under your choice and then click "Use Selected Avatar" and you will have an avatar.
For signatures (banners), you will need to choose a signature that you have made yourself or one that someone else has made. Or, you could simply type in some text like you see some have done here. Just type your quote just like you would a post and then click "Update My Signature" at the bottom of the post box. If you want to use a banner, you will need to make sure you have copied one and stored it at an image hosting site, like
Photobucket or other. Once you have done that, it's a simple matter of copying the
IMG code into that text box I mentioned above, then clicking on the "Update" button and you're done!
If that's not clear, go ahead and PM me and I'll help you.