when you post a thread you click New Topic.
you type all the stuff you want then you need to click the paper click (you will see this will typing your post).
find the file and upload it.
also you will need to upload your file here:VirusTotal - Free Online Virus and Malware Scan and copy and paste the link into your post.
and post a screen shot of the hack.
PM if you have any other trouble.