Sorry, I've given Blesta a try and am now uninstalling it.  Just google blesta tutorials, you get a link to 2 videos, great if you want to learn how to upgrade or install the product.  Well installation was easy as I used Softaculous, so thats the end of the tutorials as far as I'm concerned. 
  
I google whmcs tutorials and they have about 30.  They dont offer a trial but they do offer a money back if I'm not satisfied, so time to try them I suppose. 
  
Goodbye Blesta, I had high hopes for you but at this rate my trial will have expired before I even get the thing configured.