You connect by having two instances of the emulator running at the same time. There is a Link option listed under Options. In the Settings screen, make sure Single Computer is selected. The first instance of the emulator will have saved games with the .sv1 extension. The second would be .sv2. Just change the extension of the save game (which would be .sav in VBA-M) and make sure VBA Link is set to look for them in the correct folder, and it'll recognise them.
