There is an InDesign specific font folder in the InDesign application folder but you've given us next to nothing as far as information goes.
What version of ID? What operating system? What font is showing up as missing? Is it available in other applications?
This is probably the best place to get support for the kinds of issues you describe, but as Bob's indicated, you need to give full details.
In addition it would be useful if you did a bit a study, this book would be good: Adobe InDesign CC Classroom in a Book (2017 release): Kelly Kordes Anton, John Cruise: 9780134664095: Amazon.com: Books and the online video tutorials from Adobe TV (free) and the paid-for ones from Pluralsight.com and Lynda.com are excellent (you can get a 30-day free trial).
Thank you so much for replying so swiftly.
Here’s the info that yo mentioned:
Version of ID: Indesign CC (2017)
Operating System: macOS Sierra 10.12.5.
I have files that were originally create some time ago by my designer.
However when I open these files, it shows that the fonts are missing. These are Kabel and Kabel Heavy as per screen shot here <https://www.dropbox.com/s/3gqmxkyxtgcsw5t/Screenshot%202017-07-29%2015.07.40.png?dl=0>
If I click Find Fonts it suggests that I replace with a different font (Minion) as per screen shot here <https://www.dropbox.com/s/8822wh8fzh4x6fu/Screenshot%202017-07-29%2015.08.46.png?dl=0>
However, if I try and replace this font with the correct one which showed up on the list, it doesn’t let me do this. I therefore downloaded and installed two more fonts but again although it sees them in the list (see screenshot here) <https://www.dropbox.com/s/996gf7c7oj62b5o/Screenshot%202017-07-29%2015.11.46.png?dl=0> ,if I select these it doesn’t do anything.
I therefore went through forum and found someone suggesting ensuring the font was in the fonts folder of Indesign. However on searching for this, I found there is no fonts folder (screenshot here) <https://www.dropbox.com/s/n4yc7cnit4lezv8/Screenshot%202017-07-29%2015.14.18.png?dl=0>
I then tried going through the support options on Adobe support but that just takes me back to forums. If you’re able to help, I’d really really appreciate it!
I did find someone who was having a similar issue but it wasn’t quite the same. He did at least have a fonts folder but his issue looked unresolved.
Thanks so much, Lucy