From: Specify trunk <project_name>
Revision: Choose a revision number (Probably the revision no from which the Branch was created or if previous merges have happened, then the last revision when a merge was done)
To: Check 'Use From URL'
Revision: Head Revision
Merging from Subversion (SVN) Branch to Trunk
From: Specify Trunk <project_name
Revision: Head revision
To: Specify Branch <branch_project_name
Revision: Head revision
