Ok I tried the code but I still can not get it to work

must be something I’m doing wrong, >:( let me ask, after I do all of the above rename the htaccess file, put the code above in it, and turning friendly URLs on
Use friendly URLs: yes
Use friendly aliases: Yes
Suffix for friendly URLs: shtml
it should work right? or am I missing a step? and the URL should be the alias right, if I have a page with id=4 and alias =chair the new URL should just be chair.shtml correct ( my suffix is shtml) or am I still missing something?
thanks for the help