Integrate the Email Collection Bar to Launch Theme with placeholder option

Step 1: Select the last option under the "position" setting in the bar configuration in the App, and save the change
Step 2: Go to Admin > Online Store > Themes
Step 3: Click the "..." button on the right hand side, and select "Edit HTML/CSS"
Step 4: Click "header.liquid" under the "Assets" folder
Step 5: find line <div class="header {{headerClasses}}">; Copy and paste <div id="ecb_placeholder"></div> below it in a new line
Step 6: Click "Save"

NOTE: Do NOT forget to select the last option under the "position" settings in the bar configuration in the App, and save the change