To add ‘value’ and ‘currency’ parameters to a gtag event in Google Tag Manager, first, sign into your Google Tag Manager account and select your desired website. Go to Tags, then click New to create a new tag. Choose Google Analytics – Universal Analytics as the Tag Type. Choose Event as the Track Type, then insert your desired Category, Action, and Label. Now, to add the ‘currency’ and ‘value’ parameters, click on the fields to trigger the variable menu or manually type in the values directly. Fill these fields with your desired currency and value. Remember to set your Google Analytics Tracking ID in the field provided. Now click Save. After setting this up, confirm changes by clicking Submit at the top-right corner. This will enable the ‘value’ and ‘currency’ fields in the Google Analytics events on your website. Test the new setting by triggering the event in your website and checking the Real-Time section of the Events category in your Google Analytics account.