How do I put subscriber's name into my email

Hi, in the subject line there’s a merge field. where is the merge field for adding personalized ‘Hi’ in the email box /text box itself?

thank you

If you click on the Merge button in the email editor then anywhere you want to place a name or other contact related information in, you can use the merge field box to click on the information you want and that will insert the merge code for that element into wherever the cursor is located at (ie subject line or body…)