In order to enable the manual statistics update in Awstats, you should edit the following file:

tmp/awstats/awstats.yourdomain.com.conf (substitute yourdomain.com with your domain)

Look for the following line:

AllowToUpdateStatsFromBrowser=0

and change it to:

AllowToUpdateStatsFromBrowser=1

If you are having stats problems with your website, ask your host for assistance. SiteGround has long experience in resolving such issues and our support team will be ready to assist you.