While tuning guitar, 1st string coming as 2nd string on tuner ? What do I do ? Happening for the first time.
If the strings are properly in place, my guess is that the string is either too tight or too loose. So, instead of the usual E that it's supposed to be, you see a B. Just tune it until it gets to E. Just make sure to understand if you have to loosen it or tighten it.
It might help you to find someone who knows how to properly tune a guitar so as to show you.
There are many youtube videos that show how to tune a guitar for beginners:
Moreover, sometimes the tuner listens to the fifth, because it's the first overtone over the octave. So, try playing the 12th fret harmonic to see what the tuner listens. Another solution could be to tune the other 5 strings and then play the B string on the 5th fret and see if the sound is the same as the the open high E string.