How to revert back to not require rasterize for Photoshop?

Question

I used to be able to color any Text, shape, or image by just selecting the particular layer and use pain bucket tool for example. Not sure what I clicked, but recently when I try to do the same; I always get the message
"This type Layer must be rasterized before proceeding. Its text will no longer be editable. Rasterize the type? "
I do not want to rasterize. Can I know how to revert back to the normal setup where I can do the coloring without the need for rasterize please.
It also seems to mess around with my selection.
For example - I have a circle shape in the middle with transparent background.
I used to be able to go Select>All followed by Select>Inverse and it will select the circle shape.
But now it selects the entire canvas when I select all but returns the following error when I Select>Inverse
"Warning No Pixels were selected".

Answer 1

Type:
Double-click on the T in the type layer.
In Type Options bar click on the color swatch which will open the Color Picker.
Choose a color and Commit.
The Type will remain vector and the color will have changed.
Circle:
If the circle was drawn with the Elliptical Marquee tool, Edit > Stroke'd with a color and then had the marching ants deselected:
Click on the transparent area with the Magic Wand tool. If you want to include in that selection the inside of the circle unclick Contiguous in the Magic Wand Options bar.
Then, inverse your selection to select the circular line.