Hello. does anyone know if you can mark a program safe that you know if safe. please direct me to it 
Thank You
Can you inform the file as being a false positive?
To know if a file is a false positive, please submit it to VirusTotal and let us know the result. VirusTotal has a file size limit of 10Mb. You can use VirScan also.
If it is indeed a false positive, send it in a password protected zip to virus@avast.com. Please, mention in the body of the message why you think it is a false positive and the password used. Thanks.
Are you using Linux or Mac version of avast?