How do you solve the magic square using 6,7,8,9,10,11,12,13,and 14. The sum is 30

See here and use your numbers in place of 1 through 9 in the 3-by-3 magic square.

https://www.askmehelpdesk.com/mathematics/3x3-magic-square-solver-471125.html

A little shifting may be in order, but if you place 6 where 1 is, 7 where 2 is, and so forth, you will get it.