Sirdar patttern no. 9502 help! confused with pattern

Hi i’m quite new to knitting and this is my 2nd knitting project (apart from numerous scarfs and baby blankets!!) I’m a little confused about what to do with the following instructions.
This shrug knits sideways starting with the back/shape right sleeve. I’ve casted on 30 sts as requested and knitted quite a way and i’m now on the shape back part. The instructions say to do the following:-
1st Row. inc in next st 1 times (shoulder edge), knit to last 4 sts, p4.
(the last 4 sts set border sts)
2nd Row. k4, purl to end
3rd Row. inc in 1st st 1 time, knit to end
4th Row. purl
(all straight forward but then says)
it says 1st to 4th row sets st-st with 4st border
keeping continity of 4st border and st-st proceed as follows

next row: inc in 1st st (o times for my size), knit to last 4 sts, p4.
next row: k4 purl to end.
i get this also but then i’m totally confused over the next part.
its says work 29 row inc 1 st at shoulder edge only as before in 1st and every follow 4th row.
so do i know just keep repeating the last 2 row (inc in 1st st. knit to last 4, p4 / then k4 purl to end.
or do i keep repeating the last 6 rows until i’ve knitted 29 rows in total and inc every 1st row and then every 4th following row???
Please can anyone help me??
thanks so much, Lisa…

its says work 29 row inc 1 st at shoulder edge only as before in 1st and every follow 4th row.
so do i know just keep repeating the last 2 row (inc in 1st st. knit to last 4, p4 / then k4 purl to end.
or do i keep repeating the last 6 rows until i’ve knitted 29 rows in total and inc every 1st row and then every 4th following row???

When it refers to ‘inc 1 st at shoulder edge only as before’, it’s referring to the increase sts you did back on row 3 [I](3rd Row. inc in 1st st 1 time, knit to end).[/I] So on this new 3rd row you do the inc at beg of the row, then work 3 more rows (purl, knit, purl) and on the 4th row, increase again.