Open Canary and start a new email, select the word/phrase you want to use for the link.
Right click > select Format.
Then select Hyperlink.
Open Canary and start a new email, then copy the URL that you want to hyperlink by navigating to it in Safari and long pressing the URL until the copy option pops up.
Now paste it into your email by tapping in the whitespace and selecting "paste."
Move your cursor anywhere within the URL text.
Type in the text that you want to be linked.
Now delete the text of the URL around your text. This way the link is preserved but the text is changed. Tap Send and the recipient will receive your email with your working hyperlink in it, all they have to do is tap/click on it.
Open Canary and start a new email, then select the word/phrase you want to use for the link.
Then select the hyperlink symbol from the formatting menu.
Type / paste in the URL for the website to which you are linking.