To use "availed" correctly in a sentence, you need to use it with a helping verb or in a passive voice construction.
Here are some examples:
With a helping verb:
* He availed himself of the opportunity to travel.
* She availed herself of the discount offered.
* We availed ourselves of the free trial.
In a passive voice construction:
* The opportunity was availed of by many.
* The offer was availed of by her.
Note: "Avail" can also be used as a noun, meaning "use" or "benefit."
* The medicine was of no avail.
* He sought the advice of the doctor, but to no avail.