How to edit text
Open the Photoshop document with the text you want to edit. ...
Select the Type tool in the toolbar.
Select the text you want to edit.
The options bar in the top has options to edit your font type, font size, font color, text alignment, and text style. ...
Finally, click in the options bar to save your edits.
To fix this, just correct your Image Size settings by going to Image Image Size. Uncheck the “Resample” option so that it doesn't change the pixel dimensions of your document. With this option off, if you're your document is 1000 pixels wide, it'll stay 1000 pixels wide no matter what width or height you enter.