First ensure you have the latest program version 4.8.1282 as the submission process has been improved.
Send it from the Infected or User Files section of the chest (select the file, right click, email to Alwil Software). This process has been modified in the latest version to make it easier, it doesn't actually get emailed, but transferred when the next avast auto (or manual) update is done.
No print function for the chest that I'm aware about but if you could do a print screen or screen capture, expand the columns, etc. so you can see what you need, etc. and print screen or capture it and print the image. See example, having captured this I have scaled it down to 60% to reduce the file size.
You could also look in the C:\Program Files\Alwil Software\Avast4\DATA\log\Warning.log this reports all avast detections, though it doesn't say what action was taken on detection (e.g. if you sent it to the chest).