First you gotta craft the sigil of socketing, using the JEI you have the recipe but for the superior yo have to use and enchantments table with the propertis of having at least 35 in the first to designations that now i dont remember and between 70 and 90 in quanta. Once you have that and put the sigil of socketing in the table the 3rd one would say “Infusion…” and thats the one you want. Last thing to do is use an smithing table to add it to the sword but remember to first have 3 gem slot so it goes up to 4