Sorry no one can read you mind so we will need some information. Though don't post active links to what is considered a suspect site, just the domain name no hxxps, etc.
A screenshot of the Avast Alert with the Details option selected would help.
Attaching Images to your post - When you Click the Reply button it opens a text window for you to post your comment (reply or post).
Click the Preview button, that shows what you have input and expands it to include 'Attachments and other options'. Click that it further expands, here you can attach images, etc. at the bottom of your post.
See my attached image, click to expand.