There are no limitations in the Trial Version. It is the fully featured Professional Edition.
Did you edit the glyphs to make them bolder?
The metric settings just tell Windows applications whether a font is to be treated as regular, bold, italic, or bold italic. A typeface like Times New Roman will have four Truetype Font Files. Changing the character attributes in Word to bold will tell word to use the bold font file. (Open all four typestyles of Times and compare the settings on the Metrics, Classification, and Post tabs.)
Your font is presumably Regular. So you would need to save it as a new TTF file, change the metrics as described in the manual, then use the Glyph Transformer Wizard to modify the glyph outlines to make them bolder. See my Tutorial on Working with Transformations
Depending on the design of the font it may be very easy or very difficult to create a satisfactory bold version. Sans Serif fonts tend to be the easiest to transform, whilst scripts tend to be the hardest. To get a good result with Serif fonts also takes a bit more than two clicks.
Making a true italic from a regular font requires drawing completely new glyphs, especially for lowercase letters, but FontCreator can Skew the glyphs to the desired angle to make an oblique typestyle.