How can I let my clients (which are no administrators) see the actual wordpress site not the coming soon site.
You need to give them a login and a user role. Then open up soonr-coming-soon.php and go to line 194. Add the following for this line:
if($UserData->roles != "administrator" && $UserData->roles != "editor" && $UserData->roles != "author")This will give administrators / editors / authors the possibility to see the actual wordpress page. If you have other roles just change it to your needs.