To sign up, just click register in the login box. It is in the lower left corner of the box.
Then fill out the registration form and click submit:
Note: because this server runs on a potato, it will take a second or two to validate your password. Please be patient as it logs you in.
The left column is split into 5 boxes:
The first box contains your profile information, as well as the message composer. The message composer is used to post your status updates.
To edit your profile, click on the gear icon in this box.
At the bottom is the message composer. This is a text box where you can type in whatever you wish to post. When you are done, click the Submit button.
If you want to attach media, click the upload icon. This will upload your media and include it with your post.
The next box is the timeline selector. This allows you to select up to four timelines.
The timelines are:
This box just contains information about pleroma.site, such as a link to this guide.
Pleroma includes a chat system, by default this is just a small box in the left column:
To write to the chat room, just type a message in the text box at the bottom and hit enter!
This box just contains notifications. To mark them as read, click on the "Read!" button.
The right column displays whatever you are actively interacting with. Usually this is a timeline, but sometimes it is a settings screen.
If you click on the gear icon in the top left box, it will take you to the User Settings screen:
If you have a Mastodon follow list CSV file, you can use the Follow Import feature at the bottom to import it.
Pleroma includes the Mastodon UI as an alternative. Just click "Mastodon Frontend" on the left column to get to it.
Apps are discussed here.