There are different citations you can you, below is one of the methods:

Last FM, Last FM, Last FM. Title of article. Last updated date and retrieved on date from link

Last FM = Last name followed by first and middle initials date = Full date in any format

For example:

Smith AB, Wilson CD, Jones, EF. Approach to critically ill patients. Last updated 2020-01-31 and retrieved on 2020-02-08 from https://openmed.school/approach-to-critically-ill-patients

Open Medical School. Title of article. Last updated date and retrieved on date from link

For example:

Open Medical School. History and physical. Last updated 20 January 2020 and retrieved on 5 February 2020 from https://openmed.school/history-and-physical