Step1
Have the document whose line spacing you want to adjust opened-up and on your screen.
Step2
Select/highlight all the lines you want to change.
For instance, if you want to change the first 3 paragraphs only, then you'd select just those ones.
If you want to adjust the whole document, then you can select all the text quickly by:
1) Pressing and holding the CONTROL key
2) Pressing the letter A key.
Or if you prefer, you can click the EDIT menu and choose the option that says SELECT ALL.
Step3
While the text is still selected/highlighted:
1) Click on the FORMAT menu
2) Choose the PARAGRAPH option
This will bring up a popup menu with your various line spacing options.
Step4
Towards the bottom-right of that popup menu, you'll see a section called LINE SPACING. This is where you'll choose how much space you want in between things.
Click the DOWN arrow right underneath LINE SPACING. This will give you all the different line spacing options from which to choose.
1) SINGLE means single-space
2) 1.5 LINES means space and a half. It's in-between single and double-spacing.
2) DOUBLE means double-space
Step5
Once you've made your selection regarding your line spacing, right below that, you'll see a big white box that's labeled PREVIEW. This shows you what your text will look like after you click OK.
Step6
Once you've got your line spacing chosen, just click OK at the very bottom and your document will be adjusted. That's it!
Step7
If you want to readjust your spacing to something else, just repeat steps 2 to 6.
If you're completely done, just click your mouse anywhere to turn off the highlighting and you're finished.
Now that wasn't so tough was it?