How to install a program ending in ".run" using terminal [duplicate]

I am following How to Install AMD ATI Radeon Graphics HD 6770M

but at step no 5. i don't know how to do it 5 - Install Catalyst driver, type the following commands on terminal:

cd ~/Downloads 
chmod +x amd-catalyst-13.4-linux-x86.x86_64.run
sudo sh amd-catalyst-13.4-linux-x86.x86_64.run

this file in the downloads spot how can i use this command to install it

because i can't run it as execute as program

Press the super key and search for terminal...

and activate it ...

Now type or copy/paste these lines one by one (so pressing enter after each line):

cd ~/Downloads 
chmod +x amd-catalyst-13.4-linux-x86.x86_64.run
sudo sh amd-catalyst-13.4-linux-x86.x86_64.run

the 1st 2 commands will show nothing when executed. The last one will ask for your admin password and then show a lot of lines. Watch out for errors :)