The code you are given in Affiliate Admin is the complete HTML code required to create a link, so you'd just paste that as-is into your Web page's source code. If you want to place a link somewhere that does not allow you to paste HTML, you will need to extract the link URL out of the code you obtain from Affiliate Admin. If the HTML code for your Affiliate link looks like this:
<a href="https://www.e-junkie.com/ecom/gb.php?cl=XXXXXX&c=ib&aff=YYYYYY" target="ejejcsingle">Click here to view more details</a>
...then the URL portion of that (which you can provide to TinyURL.com or paste into a plain-text email or a browser address bar) would be just this part:
https://www.e-junkie.com/ecom/gb.php?cl=XXXXXX&c=ib&aff=YYYYYY
The XXXXXX and YYYYYY parts in these examples would, of course, be different for you, and unique to your own particular codes/URLs. Note that the URL does not include the target="ejejcsingle" from the full link code.
