You can find information in user guide from page 67. Anyway you have to use as control point (but without coordinate). You have to recognize the same point in different photo (at least 3 user tie points must be defined in 4 images (2 measures in each component that you want to fuse). If you already had an aerotriangulation, if there is some problem when you put the user tie point will be yellow or red (because the fisrt aerotriangulation is not correct). After insert user tie point resubmit aerotriangulation. Now (if user tie point is enogh and correct) if you check user tie point will be showed green.
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