There is a simple trick to make the words bold on musing. If you are posting from the mobile, initially you will not see any formatting options.
Here is a small trick which can help you to make the words or statements bold.
1. Initially compose your answer
2. Submit the answer, let it get published
3. Go back to edit option
4. Now probably you will see the options like bold and italics and now you can also add images
Thanks. I saw now that it was right under my nose the bold button.