Step 1:
Go to Campaigns > Create Campaign.
Step 2:
Select Email or SMS Campaign and click on “Create Campaign »” button.
Step 3:
Name your campaign, select the segment you'd want to have it sent to and click on “Continue to Content” button.
Step 4:
Set a Subject line, create your email, then click on “Continue to Review” button.
Step 5:
Next, review your campaign and Klaviyo's suggestions and schedule or send the campaign when you're ready.
This Klaviyo article offers more details on how to set up your campaign.
Here's a quick video tutorial for more details:
