right click on the address in your browser's address bar, and select 'copy'.
Now go to your web site page (in whatever software you're using) and select the text or whatever it is you want to use as the link. Right click, and in most website design programs you'll see an option to 'create hyperlink' - or words to that effect.
Left click on that option, and then, in the dialogue box that will appear, paste the address you copied from the ImageShack page.
I can't provide more specific help unless I know which program you're using to create your site.