Cello notations

I am attempting to use Musescore to notate cello music. I would appreciate help in addressing two issues:

1. Certain fingerings require stretching fingers either up or down the keyboard. Using a MacBook Pro I have found a sequence for each, respectively "Option+I" and "Shift+option+T." While the resulting characters, ˆand ˇ, signify the desired motion, they are so small that they are difficult for most cellists to read. Are there slightly larger characters I could use?

2. To add a symbol to the palette from my score, I have been advised to "ctrl+shift+drag it in". I have tried this on my MacBook Pro to no avail. Is this the correct approach? If not, what is?

Thank you.