word puzzle in captain's desk

[malaina]

I got all the words I need to go horizontally, but how do you write some of the words vertically (in columns?) I click on the letters I need to make a vertical word but it just writes it next to me horizontal words Help!!

[Swamp Spell]

You have to right click, I believe?

[malaina]

You have to right click, I believe?

Thank you!!! (I forget about right-click on Mac )