Problem to have one team site

Hi,
I try to create one Team site, within Sharepoint 2010 CA.

https://dl.dropboxusercontent.com/u/40211031/tt26.png

but "OK" button is not enabled, in above. Why?
LVL 12
HuaMin ChenProblem resolverAsked:
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Walter CurtisSharePoint AEDCommented:
Have you created a web app yet?
HuaMin ChenProblem resolverAuthor Commented:
No. I do encounter the problem shown in above.
Walter CurtisSharePoint AEDCommented:
The problems shown above is because a web app has not yet been created. Unusual, but possible.
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HuaMin ChenProblem resolverAuthor Commented:
Thanks a lot. I've already created one Web app without problem. Then I try to put the following
https://dl.dropboxusercontent.com/u/40211031/tt29.png

to create the Team site but I don't know why I get this
https://dl.dropboxusercontent.com/u/40211031/tt30.png
Walter CurtisSharePoint AEDCommented:
Your url cannot contain an underscore, underline or however it might be called. This character "_"

Try a different name.

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HuaMin ChenProblem resolverAuthor Commented:
Thanks. I create New Web Application to have

https://WIN-O3CHI1MHE5D:44782

but when I proceed further, now I still get this
https://dl.dropboxusercontent.com/u/40211031/tt51.png

Why?
HuaMin ChenProblem resolverAuthor Commented:
I've requested that this question be deleted for the following reason:

No clear answer given
Walter CurtisSharePoint AEDCommented:
Thanks
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