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Please note:
This article applies to ActivityTools in
Microsoft Dynamics CRM 2011 and CRM 2013

(Click here for information on how to enable debugging in ActivityTools in 
higher CRM versions) 

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Basically, there is one way to activate debugging: 
Activate debugging via the Web.config 

Solution:

Open the Web.config. This file is located in the installation directory.

Now open the Web.config with the notepad and search for the debug setting and set this value to true.

Figure 1: web.config

Please note: Enable debugging only, when you have to send us the debug files.
Disable it by setting the value to false.

Please do not hesitate to contact us, if you require further information or our assistance.