Can anyone help please

[#1]

Below is a fault report that I see when I attempt to install files that I have uploaded to my CGI site. It seems that the chmod figure may need changing but I can't  see where this can be done. My FTP program does not give the option to do so and right clicking on the file does not lead me to a solution. 

Execution of (forum/webinstall.php) is not permitted for the following reason:
Script is not executable. Issue 'chmod 755 filename'
Server Data:
Server Administrator/Contact: support@plus.net
Server Name: ccgi.raffia.plus.com
Server Port: 80
Server Protocol: HTTP/1.1
Virtual Host: ccgi.raffia.plus.com
Request Data:
User Agent/Browser: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)
Request Method: GET
Remote Address: 87.115.164.198
Remote Port: 1105

[#2]

What FTP program are you using?
As an example, in Core FTP you would connect to your ccgi site, then right-click on the file in the right-hand pane (i.e. the file on the server, not the local one), select Properties and then check/uncheck read, write and execute as required.

[#3]

start->run
telnet ccgi.plus.net
(enter username)
(enter password)
fixphpperms.sh -r
quit
Then it should work
B.

[#4]

Thank you for your replies - on trying to change permissions using telnet I don't think  I'm entering the instructions correctly. Should there be spaces between username, password and fixphpperms.sh -r. Or even hyphens or commas ?. What exactly is the form of entering this command.

[#5]

Thank you both, the problem is now solved. For me the answer was to use the FTP program 'CuteFTP8' which made dealing with file permissions very easy.
Much obliged to you.