How can I reset the "low tire" message?

[sunita]

Hi:

My H3 currently has 20" tires ( nitto terra grappler) The tires have recommened pressure to be 40 psi. After I noticed the "low tires" message, I tried putting in 40 psi. The message remained there. I currently have them at 35 psi but the stupid message is still there. I need some advice on how to get this message off. I think I have to reset but I cannot find how to do so. Please, if anyone knows how to deal with this problem, I would appreciate the help. Thanks.
Sunita.