As many people have said before don't mess with the din's yourself unless you know what you are doing. That being said, on most bindings it is just 2 screws per ski to change the din and unless you really mess with them a lot, there is some wiggle room when it comes to setting them (also some shops refuse to set them higher than the chart says for liability reasons) so if you know what your din should be then you'll have to change it yourself.
Biggest question is are you prereleasing? Do your skis come off when they should not?
yes: you might need a higher din
no: your din's are at a good spot
second is how often are they coming off too easily and under what conditions?
if they are coming off completely randomly then take them into a shop and ask for them to help you out because your din probably needs to move up a lot or your binding has other problems (maybe toe height or something).
Most of the time if my din is just slightly too low then i can kindof feel why they released (either hit something or landed and pressured one ski too much or something like that). Basically if you think you could've skied away without an injury if your ski had stayed on then maybe try moving the din up in 1 unit intervals then ski on them and see how they feel.
Hope this helps. If you really don't know much about bindings the safe bet is to take them in. Don't want to mess them up and get hurt because of it.
