Collage offers a single top OR bottom title per project page, which can be found by clicking the text button to the left of the project:
Clicking the top or bottom title option will add an editable text block to the project at the top or bottom of the design (the title option can be found under the Text option below the project on mobile).
If you click on the text, the text options will appear. This allows you to change the font and font color. The font size is automatic and will depend on the amount of text added to the title space.
Once the title is on the project, you can also click the text, then click edit to add to or edit your text, or click delete to remove the title completely.
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