Brother, it will be difficult to show it by uploading images due to post size constraint. However, I am trying to enlist here the steps required to do it.
1. Open the single post by clicking the post # on top right corner (post # link is on left side of reputation buttion).
2. When the page opens, copy the adress written in the address bar.
3. Now, while posting reply under 'quick reply' section, click on 'Go Advanced' button. Now some more editing tools/buttons will be added on the top of text area and you will see 'Insert Hypelink' buttion just below the 'Smilies' button.
4. Click on 'Insert Hyperlink'. A dialogue box will appear with the text: 'http://'.
5. Erase this text and paste the address copied earlier into this box. Something like this will appear:
[URL="http://www.cssforum.com.pk/359703-post241.html"]
http://www.cssforum.com.pk/359703-post241.html[URL]
6. Now whatever you want in place of bold part as shown above, it will display as hyperlink in your post. I have written 'Test Post' in place of bold part shown above that is why it is appearing as it is below:
Test Post