look here is how I do mine ALWAYS:
1. Loosen the locking nut bolts (3 on the headstocks/neck)
2. Tune your strings to the desired tuning, the trick is to tune the strings in this order; Low E -> A-> high e -> B - > D-> G or numerally, string 6 -> 5-> 1 -> 2 -> 4 -> 3. this will have better results and requires less times doing it.
if the trick makes no sense to you just tune them starting the low E first.
3. If the strings arent in tune yet keep repeating step 2
4.check if your floyd, thus the entire system is level with the guitar body, If it is skip to step 6
5. adjust the springs in the back of your guitar until the floyd is level with the body, then go back to step 2
6.
IF your strings give buzz , try hightening your floyd bridge by turning the pivot stud screws. do about a quarter of a turn on each one. go back to step 2. if no buzz was heard, just continu to step 7
these are the pivot stud screws
7. Lock your nut and retune your guitar, you will have to retune many time and when its done let it set for about 2 hours, then retune and play it, after that retune again and it should be fine and stay in tune for a long time
hope it helped