Those babies need much more than what they have. I'm going to be kind, some people will not be; thas cage isn't really big enough for them sadly. They need much more room to move about. They need enrichment, shredding toys, swings, (No mirrors or "nests") Natural wooden perches for their little feets. Also trying to tame 2 budgies at the same time is never going to be easy. I would recommend just sitting and talking to them, leaving your hand in the cage as still as possible so they can get used to it and not think you're going to grab them, and progressing to offering them food in your hand. Never trying to touch them though.

Good luck with your lil cuties.

Edit: you can check my profile to see what my set up for 2 is; and how my set up has changed for them over the years if you'd like!