You use them like an ordinary stitch marker at the beginning of the round or row, but instead of just slipping from one needle to another you move down a link. I like adjusting the length to whatever the pattern requires and moving from the plain end towards the bead.
Now we've placed the row counter, so we make the increases. (If you're curious, that's LR-inc as per Cat Bordhi, sometimes called the lifted increase. I'm experimenting with which component to twist to close up gaps. I will eventually report back with results.)
Knit merrily around. You can use row counters before each increase but I find that too jangly. I prefer to use the row counter only at the beginnin of the round, in place of the first stitch marker. Then I just check back as necessary to see what pattern row I'm on. Same with two-at-a-time socks, just in the beginning of the round on the first sock.
I like tracking cable patterns, particularly on the straight bits where you're trying to see if that is the fourth or fifth row since the last crossing, as well as increases/decrease rounds. The best thing about these row counters is that they stay in your knitting, so if you put down a project for a month or year, you don't have to look up project notes or keep checking row counts, because your marker is there in the fabric telling you what row you're on.
Obviously you can make them longer and if you ever want extra links thrown in an order, just let me know. But I find longer than 6 and I start to get annoyed by the dangle, so I'll count by fives or use other obvious clues in the knitting to track rows.
I'm working on some ideas for length-checkers but it will be a while before I get those tested. Ditto with crochet markers. I like crocheting but I hate counting, and I'm not proficient enough to read the stitches as well as in knitting. I'll keep you posted on progress on that front.