"Only if we first have a second referendum without the lies."
With unicorn-delivery of polling cards perhaps.
"Where can I sign a vote of no confidence in him as an MEP?"
You can't. Or at least you can't to any effect. You cannot get rid of any of your regional MEPs, and the perceived remoteness of MEPs is of course one of the issues.
Though of course if you could just get rid of elected representatives because not all voters support them, then a lot of institutions would change and the whole system would be untenable.