Applying to merchants on ShareASale is a straightforward process. You should first sign up for a ShareASale affiliate account. After logging in, you can browse the available merchants. You can search for merchants in your niche. Once you find a merchant you want to promote, click on their program. You will see an "Apply" button. You should fill out an application with some basic information about your website or blog. Some merchants may ask for additional details. You should submit your application for review. After approval, you can start promoting the merchant’s products and earning commissions.