Press a html button via shell script?

i am currently trying to write a script to change some parameters on a webpage via a shell script. I can change the values in the textboxes without any problems, but i can't seem to figure out how i can "press" the Apply button.

This is how i change the values, as you can see i need one final "Apply" button press.

setJitterDelay()
{
    rate=${1}
    if [ "${rate}" == "low" ]; then
            ((htmlJitterNegDelta = 5))
            ((htmlJitterPosDelta = 5))
            ((htmlJitterDelayMax = 10))
            jDelta=5
    else
            if [ "${rate}" == "med" ]; then
                    ((htmlJitterNegDelta = 25))
                    ((htmlJitterPosDelta = 25))
                    ((htmlJitterDelayMax = 50))
                    jDelta=25
            else
                    if [ "${rate}" == "high" ]; then
                            ((htmlJitterNegDelta = 50))
                            ((htmlJitterPosDelta = 50))
                            ((htmlJitterDelayMax = 100))
                            jDelta=50
                    else
                            echo "error: low, med, high not selected! Skipped..."
                            return
                    fi
            fi
    fi
    ### APPLY BUTTON
}

I used Firebug to know which values i had to change and the Apply button says this:

  <input id="appFlowBw" type="submit" value="Apply" name="appFlowBw">
<form action="http://wanemu/XGEM_REV_BW_FLOW?blade=1&profile=0" method="post" name="rev_bw_form"></form>

The input is inside the form in the source code:

             <TR>
          <TD colspan="8"></TD>
          <TD><INPUT type="submit" name="appFlowBw" id="appFlowBw" value="Apply" disabled></TD>
      </FORM>

But i don't know how i can now "press" this button.

I hope you understand my problem and can help.

//edit: added form