If you are wondering that ‘how to change register link in header links?’, you’ve landed at correct place.
Follow the below instructions to change register link in top header links.
Please add below code in Magento_Customer/layout/default.xml file in your theme.
<referenceBlock name="top.links"> <block class="MagentoFrameworkViewElementHtmlLink" name="register-link"> <arguments> <argument name="path" xsi:type="string" translate="true">customer/account/login</argument> </arguments> </block> </referenceBlock>