To edit the text on a type layer, select the Type tool and do one of the following:
Hover the I-beam over the text in your document. It changes from having a box around it to being a simple vertical bar to show that you can edit the underlying text. Click on the text to enter Edit mode.
Drag the cursor over text in a Photoshop document to highlight it, just as you would in a word-processing document.
Double-click the T in the thumbnail of a type layer to quickly select all the text on a layer and enter Edit mode.
You can switch between horizontal and vertical text after you've entered it by choosing Horizontal or Vertical from the LayerType menu (or in the context menu that appears when you right-click on the type in your document with the Type tool selected, as shown in Figure 13.2).
When working with vertical text, the Standard Vertical Roman Alignment option becomes available in the Character ...