1-You use F12 for screenshot
2-You find screenshot in Documents/Euro Truck Simulator2/screenshots
3-You go to imgur.com and click Upload image
4-you take link with CTRL+C
5-You can now put picture in the report
Second,you should download your profile first,but not from the steam,
follow the following steps:
You should go to the Documents folder on your old computer, find there "Euro Truck Simulator 2" folder, open it and then open "profiles" folder. There will be all your profiles. You should copy all of them or only the latest (to use this option you should sort the files in "profiles" folder by date) into a cloud (iCloud, dropbox, Google Drive, Onedrive, ...) any USB and then to your new laptop.
Using the Steam Cloud is not always the best option.