It really is pretty straightforward if you follow this to the letter.
The DO servers are 'self maintained' so even if someone sets it up for you, you would still need to maintain/upgrade etc. on a regular basis so its worthwhile doing things yourself and getting the hang of things there.
The wildcard (*_) doesn't work for 'group_by'.
The jrSeamlesss module needs 'revisiting' as there are now several features that need adding to it. Its on my todo list but it's a few weeks away yet.
I've just looked at http://www.arabmuzika.com and its a Wordpress site.
Where have you uploaded the Jamroom files to? They need to be in their own folder.
Have you copied all the Jamroom5 files and folders to http://www.arabmuzika.com, including the .htaccess file?
Now sure what you mean by "this is not my 1 website" ?