Hey there - you may want to wait till your bunny is a littler older. Many people wait till their rabbits are about 6 months before they introduce any vegetables.
I tried to introduced my rabbits to herbs (parsley, dill, cilantro) at about 13 weeks, however, you have to try really slowly.
I would give my Charlie halfa sprig of dill once a day. If he got mushy poop, he was off veggies until it cleared up. I did find 13 weeks a little young for the vegetables - Charlie still got mushy poop.
I held off until he was 4 months, and then then I tried again and it was more successful - so you may want to give your bun a try and see how he does.
Introduce one veggie at a time and slowly work in other vegetables. After abouta months, my bunny was up to a full plate of greens.
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Nadia