Open a board and use the form at the top to start a new thread (an image is required), or open a thread and reply with the same form. Every field except the comment/image is optional - leaving Name blank posts as Anonymous.
Name - display name. Leave blank to be Anonymous.
Options - type sage to reply without bumping the thread.
Subject - thread subject (mostly used for new threads).
Comment - your post. See formatting below.
File - JPG, PNG, GIF or WEBP image.
>text - >greentext
>>123 - link to post No.123 in the same board
[spoiler]text[/spoiler] - spoilered text (hover to reveal)
[code]text[/code] - monospaced code block
A tripcode lets you prove you're the same poster across threads without registering. Post with Name#secretword and the secret is turned into a code like !Ep8pui8Vw2. Anyone typing the same secret gets the same code, so pick something hard to guess. Name##secretword makes a secure tripcode (!!…) that is unique to this site and can't be cracked offline.
A deletion password is saved in your browser automatically when you post. Tick the checkbox on your post, scroll to the bottom bar, and press Delete (tick File Only to remove just the image). It only works from the same browser unless you set your own password.
Most common reasons: posting too fast (wait a few seconds), a duplicate image or comment, a file that is too large or not an image, or the invisible verification failed - go back, refresh the page and try again. If you're banned, you'll see a ban page explaining why.
No account is needed and no name is shown, but the server keeps your IP address for moderation (bans, anti-spam), like every imageboard. Moderators can see it; other posters cannot.