Cannot insert text in my pdf file

Hello,

i got adobe reader and also its proffesional version. but when i open it with my proffesional one i can insert text in it but as it is a trial version the files asks for a activation key in about 1 minute after opening the file and closses automatically.

and when i open via adobe reader 9 9 not proffesional) , its a full version but theres no option for inserting a text.

please help me i need to enter a text in it how can i ??

thank you !