To add a hyperlink for a text in the email template, please follow the steps mentioned below:
Navigate to Settings--> Email template --> <Select the email template>Edit-->Save and configure template
1) Drag the "Text box" to the image.
2) Double click on the Text box, and tap on the link icon. 
3) A pop up will get displayed.
4) Add the desired URL, and it will reflect on the associated email template.
Please make sure to save the changes made.
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