I would like to disable the spaces in the usernames. For that I installed a rules module and i applied a rule. Everything is fine but now the label is still saying :
"Spaces are allowed; punctuation is not allowed except for periods, hyphens, apostrophes, and underscores."
How can i change that label ? I looked everywhere and i didn't find a thing.
I am new to drupal. I use drupal 7.
Thanks in advance for you responses.