how put url (external link) to the request template

how put url (external link) to the request template

I consider the case when the user specifies the problem, for example, indicates that there is a problem with telephony-> there is no sound in the headset, then display a web-link to the instructions on the request template (in this case, insturction how to check the sound of the built-in speaker). how can I dynamically add a web link to the instructions to the request template?

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