Hi Megan, welcome to Permies!
I moved your post into its own new thread, I hope that's ok with you. It'll help keep things organized and also assist others in the future who may need help starting a new post or thread. Trace gave some good instructions on where to locate button for starting a new thread.
Here are a couple links to some tutorials we have:
https://permies.com/wiki/34193/permies-works-links-threads#267492 - This is the super list of all of our tutorial and how-to threads
https://permies.com/wiki/75685/Thread-Tutorial - Directly related to your question, here is the tutorial on how to start a new thread, complete with pictures for both mobile view and desktop view
I hope this helps and if you have any more questions, please feel free to reply in this thread and staff, or other nice people on Permies who know how things work (like Trace here), will chime in to try and help.