Remove Mycollab menu options

Hello,

I have installed MC comunity few days ago.

I have found out it's a great application bu unfortunetly , we do not need all the features it can offer.

So , for easier use , i would like to remoe some of the buttons from menu ( i want only dashboard , mesages and user and settings to be left) .

I tried to look in the application code , but i couldnt find anything , could you guys tell me what i have to modify and where i can find it ? 

Thank you