You are not blocked from reading pages, only from editing them. If you were only intending to read a page and are seeing this message, you probably followed a red link. These are links to pages that do not exist, so they take users to an editing screen. You should have no problem if you follow only blue links.
If you would like to know when the block will expire, please search for your name or IP on the block list.
If the reason given is "username", then you or someone with whom you share an IP address has most likely been blocked for choosing an inappropriate or suspicious username. Please read that section of our blocking policy for more information. If you do not feel that the name is inappropriate, or if the name was registered by somebody other than yourself, please contact the blocking administrator, as described below.