In Signblazer there is a library - go there - then under symbols - and general - there are diamond shapes or + signs etc.
Make them whatever size goes well with the work you're doing. On big signs I use 1 inch.
Then drag 2 of which ever symbol you pick for each color you're using (3 colors - 6 symbols, 2 each color)
Using the measuring lines on each side - make one horizontal and then 1 vertical line - intersecting 1/4 of the way across the top of your sign,
click one of the lines till it turns red and then drag one symbol of each color onto the intersection - move the vertical line over to 3/4's of the way
across the sign top and click till it turns red then drag 1 symbol of each color onto that intersection
remove the lines and TA DA ! Registration marks done