You need to tell us whats going on and what's happened before relating to this.
Have you forwarded your ports?
Have you had people there before?
What error messages, if any, do you get?
Does your computer allow access to Blockland?
Are you the only one who is on your computer?
Etc.
So first tell us this, don't spam pandas and stuff and go "PLZPLZPLZPLZPLZ OMG I NEAD HELLP KEN YOO HELLP MIE> PLZ PLZ PLZ PLZ PZL PLZZL LZPLZPLZZLZLPZLZZZPL EETS NAWT WURKING 4 MIE"