Even though the Go button is missing, you can type an address and press enter.

If the Go button is missing, you can enable it manually or via the registry:

Manually:

Right-click Address and press Go Button.

Via the Registry:

Run Regedit /s <Path>\Go.reg, where Go.reg contains:

REGEDIT4                              \[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\]                              "ShowGoButton"="yes"