Click on the "Upload" button and choose the file you wish to upload (in .txt or .csv). 

Do note that the number of keywords you can upload at a single time is limited by your plan: 

After you have added a bunch of keywords to Keywords Explorer (or uploaded a list of keywords), you'll see the Overview section with the keywords you entered and their advanced metrics/stats; see image below:

Here you'll have the option to export this list. 

Do note that 1 credit is taken for fetching advanced metrics for each keyword, from your "monthly SERP updates limit":

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