Change standalone server port

I have a new install of backendless standalone on ubuntu server 14.04 and i would like to change the default port wich is 80 to another one.
How can i proceed ?
thanks

Hello @Williem Babalola
According to Backendless Support Policy we do not provide free support for Backendless Standalone. Please contact sales@backenldess.com to discuss paid support plan.
Regards, Artur.