How to delete previous and next links

Hi guys I use the twentyseventeen theme and I would like to delete the previous and next post links at the end of each article. time ago I had succeeded by inserting a “string” (I do not know if it is the correct term) in the additional css, but then inadvertently I deleted the string and I reappeared and I can no longer remove them because I have not found that kind of string that it eliminates them or at least does not make them appear at the end of each post. Can you help me ?, I thank you in advance.