I am new with wordpress. I tried to install cache into it but in last i got a message Need help.. Its urgent
First you add those text lines to a notepad then upload to your public_html using FTP account, AND rename it to .htaccess (with .)
be careful - if you already have a .HTACCESS file, dont overwrite it. if you're stuck and still need help, i'll be happy to fix it for you.