Q. How to in text cite a Mayo Clinic instructional video with no date or author?

You do have an author for this video, it would be the Mayo Clinic (a corporate author, i.e. an organization, as opposed to a personal author). You do have a date listed at the bottom of the page that the video is on.

This is the form for streaming video from the APA Style Guide to Electronic Resources, 6th edition.

Author, A. A. [User name]. (year, month day). Title of video [Video file]. Retrieved from http://xxxxx User name. (year, month day).

As with any citation, you determine what format of information you are citing, find the matching "formula," and plug in your pieces -

Mayo Clinic. (2016). How to measure blood pressure using a manual monitor [Video file]. Retrieved

     from http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/multimedia/how-to-measure-blood-

     pressure/vid-20084748

In-text might be a bit tricky, especially if you are trying to directly quote from the narration on the video. But a paraphrase is straightforward -

Any individual with teenage children should monitor their blood pressure, especially at the end of the school year as constant and endless child events pile up on top of each other, one after another after another. Proper placement of the blood pressure cuff is the first important step in doing this (Mayo Clinic, 2016).