1. The paragraph below my point 1 reply is how to change the settings in the Report file.
There is nothing to stop you changing the Expert settings for the web shield to change the Report file settings to include OK items. I feel you would soon tire of this change though.
Further explanation, from the avastUI, Real-Time Shield, Web Shield, Expert Settings, Report File and add OK files.
2. When you run a scan you have to go to the avastUI, Scan Computer tab to be able to start or modify that scans settings, in that same Scan Computer tab is Scan Logs, double clicking on one of them will bring up that log of the scan.
I suggest a period of time browsing through the avastUI to get used to where things are.