input on web page using vb application

there is an input box on web page..
called buy_weapon[27] where u enter a number of amount u want to get.
the value by default is set to zero
I like to input the value one in the box using my application
any ideas on how to do this please

this is the html:
<TD align=middle><INPUT size=3 value=0 name=buy_weapon[27]></TD>
<INPUT type=submit value="Process Order" name=buybut>

this is the code I trying to use:
WebBrowser1.Document.Forms(0).buy_weapon[27].Value = 1
WebBrowser1.Document.Forms(0).submit

but obviously wrong cause I getting an error on first line of code.

IF u will input variable into the web page,u should use post method for it...U can look it:http://oldlook.experts-exchange.com...Q_20724988.html

thnx
I looked there, thar is similar to what I doing but still getting eror on that first line

Give u a suggestion:Use the post method to input the variable value in the form of the html page..http://www.freevbcode.com/ShowCode.Asp?ID=2051