How do I activate Horde's IMP to replace squirrelMail?

I have installed Horde v5.1.6 framework and the IMP application to it. How do I replace the existing squirrelMail with Horde’s IMP? Thank you.


When I run tests against my mail server at, I get the following error :

Fatal error: Call to a member function write() on a non-object in /home/myservername/ on line 4106

This is the setup of my test :
server :
port : 993
User :
password : myUsernamePassword
Server Type : IMAP4rev1
Use Secure Connection : Yes

Hope this info can help