> ## Documentation Index > Fetch the complete documentation index at: https://developer.breakcold.com/llms.txt > Use this file to discover all available pages before exploring further. # How do I use custom fields when composing an email in the lead profile section? > ⚠️ Important Make sure the custom field is not empty , if it's blank, the variable will not populate in the email. ⚠️ **Important** * Make sure the **custom field is not empty**, if it's blank, the variable will not populate in the email. * Always compose your message from the **lead’s profile section**, not the **general inbox**. If you write from the general inbox, the custom field variable will **not work properly**. Yes, you can use custom fields in your email sequences. 1. Use the **"/" key** to insert a custom field into your email. 2. Click on the desired field (e.g., /First Name, /Company, /Icebreaker) to insert it into your email. How do I use custom fields when composing an email in the lead profile section? screenshot 1