Ancestry is slowly transcribing the 1911 census - it's not a job you can do overnight. Some parts of it are searchable now, but not all. (The Wales census is complete, for example. England is obviously a much bigger job) The images are all there, so if you know the address you can find the return, but it will take a while before you can be confident of finding the information by searching on a name.

Find My Past had a head start on transcribing the census and has it mostly all searchable already, so if you can find a library or record office with a subscription, you can search there. Or, as Will says, go to the Census 1911 site (part of Find My Past) and buy credits for just those searches you need.