could be problems with your (upper) back muscles being tight. might have to improve flexibility there. that is what could be making it difficult for you to keep your elbows up.
if your elbows are not pointed up the weight will fall on your hands/wrists which will lead to injury.
wrist flexibility is not a big factor. but of course you want to make sure you are loose and have some flexibility. some people just don't have that range of motion wit the wrists. like myself but if your elbows are pointed up your wrists should not be a major issue.
Your core has to be strong as well for this lift.
you should not add any weight to the bar until you can rack properly.
*sidenote*
not sure why
@Serious would give that kind of advice. not good advice at all.
