hello i need help with signing into messages

Did you get an error when you tried to activate? See If you get an error when trying to activate iMessage or FaceTime https://support.apple.com/en-us/HT201422. 

Also see If you can't send or receive messages on your iPhone, iPad, or iPod touch https://support.apple.com/en-us/HT204065

Use these support options if you need more help.

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help

 https://support.apple.com/en-us/HT204169

What happens when you try? Error message(s)? More information would help.