n e d e d
        d e d e d l e l l
      e e e e n n e e l e e
    n n d e d l e d e e d n l
    e l e e e e d e n n l d e
  e e l n l e e e e n e d e d n
  l l n n e e e e n d n e e e e
  e e d e e l d e l e d d n d l
  e e d e e l e d l n l l e e e
  e n l e e e e e e d e d n l l
  n n e e n n e n e e e e e e d
  e e l d e e d d n n l e e l e
  e d d l n l e l e e l n n e e

It appears 3 times. 

start         start
row           col         delta row     delta col
 5             10            1            -1
 11            6            -1            -1
 13            13           -1            -1

When delta row is 1 and delta col is -1, that's down and to the left. The other two are up and to the left, from the starting rows/col.  Even rows/col positions that are blank are counted.

DIM ltr$(13, 15)
OPEN "needle.txt" FOR INPUT AS #1
DO
 i = i + 1
 LINE INPUT #1, l$
 l$ = LEFT$(l$ + SPACE$(30), 30)
 FOR j = 1 TO 15
   ltr$(i, j) = MID$(l$, j * 2 - 1, 1)
 NEXT j
LOOP UNTIL EOF(1)

FOR row = 1 TO 13
 FOR col = 1 TO 15
  IF ltr$(row, col) = "n" THEN
    FOR dr = -1 TO 1
     FOR dc = -1 TO 1
      IF dr <> 0 OR dc <> 0 THEN
       lr = row + dr * 5: lc = col + dc * 5
       IF lr > 0 AND lr < 14 AND lc > 0 AND lc < 16 THEN
         c = col: ptr = 1: good = 1
         FOR r = row TO lr STEP dr
          IF MID$("needle", ptr, 1) <> ltr$(r, c) THEN good = 0: EXIT FOR
          c = c + dc
          ptr = ptr + 1
         NEXT r
         IF good THEN
           PRINT row, col, dr, dc
         END IF
       END IF
      END IF
     NEXT
    NEXT
  END IF
 NEXT
NEXT