Present tense:
monto/montas/monta/montamos/montais*/montan (*accent on the A)
You will find a full conjugation, all tenses and moods, at the related link below.
montar = to mount
"Montar" in the "tu" form in Spanish is "montas."
in spanish, montar means "to ride"
It means to mount or ride - as when you ride a horse.
esta is a spanish conjugation of the word are.
esta is a spanish conjugation of the word are.
To ride
Look up the infinitive (for example, one translation of "ride" is "montar", another is "cabalgar") on the Real Academia Española's website (drae.rae.es). There you'll find the conjugation of this verb - and any other common Spanish verb.
Montar a caballo.
montar en bicicleta
That is not a word in Spanish. Not a verb conjugation either.
ride a horse in spanish montar-ride caballo-horse