Hello, i posted my first thread in video soundtrack section and i can't find it (Iam new here)?

hard to tell what exactly is your point.

1) this is a thread. you do not post threads. you can
a) post something or b) start a thread.
Start a thread means that you make a new topic like you just did "here".

I assume you have posted something and it did not appear.
In general, when you write something, your post should appear immediately. When you use "Quick Reply", and hit "Post quick reply", the current website should immediately re-load and your own post should be at the bottom.
Wait for it.
Sometimes the forum server is over-used. In that case, maybe your message was lost. Just try again.

hth

In the future you can always click on your user name at the top right hand side of the page, then click on " Find latest started threads" located on the left side of your user profile. :)

Thread 121237

at the top of the home page, click Notifications and then Inbox. scroll down a little and you'll see "Subscriptions" on your left. click on it and there u go. any thread you post or make gets automatically added to your subscribed threads.