[dartho]

Edit newreply template, search for

</div>
</form>
{vb:raw footer}

and add imemdiately before:

<vb:if condition="$bbuserinfo['signature'] != ''">
	<label for="cb_signature"><input type="checkbox" name="signature" value="1" id="cb_signature" tabindex="1" {vb:raw checked.signature} /> {vb:rawphrase show_your_signature}</label>
</vb:if>

then edit SHOWTHREAD search for

<input type="submit" id="btn" value="{vb:rawphrase submit_reply}" />

add immediately before

<input type="hidden" name="signature" id="cb_signature" value="1" tabindex="1" />

You can use the code from SHOWTHREAD in NEWREPLY if you always want signature with no checkbox option.