In order to enable the manual statistics update in Awstats, please log in your Cpanel and go to the File manager. Then navigate to and open the following file:
tmp/awstats/awstats."yourdomain.com".conf (substitute "yourdomain.com" with your domain)
Next look for the following line:
AllowToUpdateStatsFromBrowser=0
When you find it change it to:
AllowToUpdateStatsFromBrowser=1