Question [Q] text justification

On my Nook tablet... when I enlarged the web text it would automatically adjust so as to fit it all in the screen from side to side, no matter what size. There is a plus sign and minus sign at the lower right that would allow me to adjust the size of print.
On my Nook HD...I can enlarge the text but it doesn't fit it all on the screen so I have to scroll side to side to read the text.
When I talked to a Barnes and Noble employee, he suggested downloading the Dolphin app which would in turn let me make the adjustments.
Does anyone know how to make the adjustments without Dolphin?
Also this is for web reading and not for reading books as those have their own adjustments.
Thank-you