There's are sections in my SCAL5 user manual covering these various topics as I cover below. Here's a link to the UM:
https://www.iloveknk.com/0um/SCAL5/SCAL ... Manual.pdfThe snapping is rather subtle in SCAL5 compared to other programs I've used so that could be the issue you're having. Sections 3.04 and 7.03
If you need the letters to be moved to a specific grid location, then you can use the X and Y on that same panel, along with the bounding box position to move a letter to a very specific location. Section 3.04
Personally, for what you're trying to achieve, I would use the top or bottom alignment icons on the Position & Size panel to make sure all of the letters are aligned the same along the top. Section 3.18.2
Then you can use the Distribute menu functions to make sure the letters are equally spaced, if needed. Section 3.19.2
If you still have issues, please post back!