first off I hope you are using heat n bond LITE...it is the one made for appliques, stitching- the regular is very difficult to stitch through- and you do need to stitch your appliques down or they will fall off when laundered- the way paper backed fusible webbing is used is- you first trace your applique designs on the paper side of the fusible. leaving a little distance between them- if they are going on different colors/fabrics you rough cut around them after they are all traced- then you press (fuse) them to the wrong side of the fabrics- then cut out on the lines- peel the paper and fuse them to the background. since you have already cut out all of your appliques you may want to just use a glue stick to place them before stitching- it would be a lot less work than trying to now add fusible....it can be done- but will be quite a job-