"I too sit up to the tall chair."
Translation:Felülök én is a magas székre.
Yes, it is. The word "is" has to be put behind the word, that it is related to. The same like in english with using "too" instead of "also".
And because the sentence wants to say, that it is "me,too", you need the article "én". (No, there isn't any relationship to the metoo - hashtag smile)
But I would prefer to say:
Én is ülök fel a magas székre. OR Én is felülök a magas székre.
Yes, it makes sense in Hungarian, in German and in English as well with ON instead of TO! :-) But the translation was not asked from Hungarian into English, but from English to Hungarian. Nobody can expect a correct Hungarian answer from the English sentence. That's why I feel mobbed again and again by some Hungarian creators. Bilingual creators should be able to know better fitting translations or at least correct them as soon as possible.
No problem with getting the correct answer and I do understand why en is essential to provide a hook for is, (thank you Judit for explaining). Nonetheless, what everyone else is saying about this question is correct. Sitting up TO the chair is wrong. We can say on or onto or in but not to.