i need to open this site http://.../....htm, mean any site i want via command button at my form, if i know the username and password can i but it direct via the same command button, to go direct to the path.

It depends on the system of authorization but normally You could do

http://<UserName>:<Password>@www......htm

However with the latest security-updates IE does not run this anymore. There is a change in the registry needed to make it work again.

copy the following lines and save them to a textfile.
Save that textfile with the Extension .Reg

When you doubleclick on it, the settings will be imported in the registry. After that it should work

Windows Registry Editor Version 5.00 
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl] 
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_HTTP_USERNAME_PASSWORD_DISABLE]
"iexplore.exe"=dword:00000000
"explorer.exe"=dword:00000000