All admins do their job differently, some care about rates some do not. That's part of knowing them, so not changing your rates is understandable.
I didn't know how to change my rates for the first year or so that I played. Anyhow, you need to enable console first. After you do that, open it up, and type in these three commands, seperately.
cl_cmdrate 101
cl_updaterate 101
rate 30000
Rates just basically make your playing more smooth.