please, help me

I would like to ask, how do I produce a formula for sending in the Annex. I can not do it. Please, help me!
1.
I have used this guide and this is the result:
This example shows a slur spanning from the bass to the treble clef. Using the mouse, select the first note of the slur, hold down Ctrl (resp. ⌘ on a Mac) and select the last note for the slur, and press S to add the slur.
2.

Thanks: Kovajani