Not everyone can endorse a business check. A qualified person might be the business owner, treasurer, secretary, or business accountant, but the business has to assign the authority to a specific person or persons.
Although some banks will accept a check with no endorsement, there might be a dollar amount limit to this service. The bank may also decide to hold the funds for longer than normal if the business check has no endorsement. The person who signs the business check is authorizing the bank to cash the check in their name, they just need to write out their own title.
So, what is the correct way to endorse a business check? To endorse a check, you simply turn it over and sign your name on the back. Most checks give you a space on the back for your endorsement. You'll see a few blank lines and an "x" that indicates where you should sign your name.