Hey Jen,
So, when you click submit a story to post something. The text you type in that box is based on a thing called markdown. For example if you want text to appear bold you have to type ** text ** with out the spaces and it'll appear like so text here appears bold. This link should provide a better explanation http://commonmark.org/help/
Steemit chat can be found here https://steemit.chat/channel/general
Theres a group called minnowsupport who have there own discord chat, they are one community on steemit.
To be honest I'm new myself but I'll try help where I can :)
Thanks!