how to include topic name in the url address?

I want to change the url of a topic posted versus the default one. The problem is when I post a topic (e.g of title "work at home"), the url will be "forum-f1.htm". Now, I would like that the url is "work-at-home-f1.htm".
For example : "https://help.forumotion.com/manage-the-appearance-of-your-forum-f45/".
Please show me how to do that.

Thanks so much.

You cant do this but you will need to buy credits to make your new URL

Go to Admin Panel>>Misc>>Credits and you will find all the information there.

We do not have this option. But as Mr. Mario said you can buy a domain name from forumtion.

Did you mean that I must buy credits for template modification? I have already my own domain name.

you must buy a domain from forumotions
outside domains dont really work very good

I bought my domain name from forumotion. It works very well. But my question is about the url of a topic. I just want to put the topic title in the url like this one
"http://tilldunkinet.forumotion.net/football-f3/the-best-goalkeeper-t40.htm"
but not "http://tilldunkinet.forumotion.net/forum-f3/topic-t40.htm".

Thanks again for your replies.

I found the solution. It's ok with english language.