Toribash
When you are making a post, scroll down and look for an option called "Manage attachments". Click it. A new window will appear. In this window, you can click on choose file and browse for the replay you want to upload. Finally, click upload and wait unitl it is uploaded.

Once you make that post, replay will be added with it.
What akmal said.
But the "manage attachments" option is located after you click on "go advanced" right below where you write your post. Just scroll down to find it, then continue on as akmal said.
<&Erth> fagm <&Erth> duck <&Erth> *fuck
Fagm duck fuck everyone.

What Akmal said, but, you need to go on toribash folder then on replays folder, then do what Akmal said