Welcome to Go, and Welcome to OGS! 
1126±86 means that the system is confident that your strength lies somewhere between 1040 and 1212 - but…
As long as you’re new, please pay no mind to the rank.
More seasoned players don’t understand it either. There are frequent tweaks and proposals to change something about it. People get rank anxiety and even quit out of fear of losing points.
You’re better off just learning the game and view the rank as just pixels on your screen. You can hide it in the settings if it bothers you. 