Convert to business account:

If you want to convert your existing account to a business profile, you just need to follow these simple steps.
Step 1: Go to your Instagram app, and navigate to your profile.

Step 2: Click on the three short-stacked lines, i.e., the “menu” option at the top right-hand corner. It looks like three short-stacked lines.

Step 3: From the menu, select “settings”.

Step 4: In the settings menu, click on the “account”.

Step 5: From here, at the bottom of the account menu, you can see the highlighted options of “switch to business account”. Click on it, fill in some added details, and there you go.