There have been several things posted about unbanning yourself on habbo, so, lemme help ya out, from my own experience
If you have been banned by shockwave, get a shockwave id changer, such as habbit.
Download HERE
If you have been name banned, get a new account
If you have been IP banned, use proxies (search google for proxy list) by ging to tools, internet options, connections, lan settings, tick use proxy, fill in the info, and hit OK
If you have been banned by User ID, use proxies.