I'm pretty sure you need to lift the tab gently and pull the connector apart (you should be able to see where the two separate bits are, and how it locks in under the tab).
Make sure to push them back fully when reassembling... I test rode mine after fixing the throttle issue and found that when I got back, I'd lost both front indicators (and would explain the strange look I got on one of the roundabouts from a driver)... I had just not pushed them back fully as they've been fine since.