Download the font file you want to use
Unzip the font file if it is compressed
Install the font on your computer
Windows: right-click the font file and select Install or Install for all users
Mac: double-click the font file, then click Install Font in Font Book
Close and reopen PowerPoint
Select the text in your presentation
Open the font dropdown menu
Choose the newly installed font
Save the PowerPoint file
If sharing the file, embed the fonts in PowerPoint if available in your version
Go to File
Select Options
Open the Save tab
Check Embed fonts in the file
Save the presentation again