TemplateToaster provides similar theme structure as that of a default theme. Default theme of Magento 2.2 does not provide option for 'My Cart' link, rather cart button is used for this. Therefore, you can add Cart button to header using TemplateToaster.
For adding a Cart button in header, please follow the steps provided below:
Open TemplateToaster -> Go to header tab -> Select checkbox for "Cart" -> Align the button at required position.