The simplest way to insert IF fields is, in my view, to avoid Word's field
insertion dialog boxes and do it more directly. The main keystrokes you need
are
a. Ctrl-F9, which inserts a pair of the special "field braces" {} that
surround each field. Everything between those special {} can be plain text
that you type in the usual way.
b. Alt-F9, which lets you toggle between "field code view", where fields
look like { MERGEFIELD myfield }, and "field preview/results" view, where
mergefields show as <<myfield>> or their results
c. select a field and press F9 to update its result.

In this case, one way you can do it is

{ IF { MERGEFIELD Title } = "" "" "{ MERGEFIELD Title } "
}{ MERGEFIELD Name } { MERGEFIELD Surname }

although I would probably use

{ IF "{ MERGEFIELD Title }" = "" "" "{ MERGEFIELD Title } "
}{ MERGEFIELD Name } { MERGEFIELD Surname }

simply to play safe.

For the IF field you can do the following

1. ctrl-F9:
{  }
2. Put the insertion point after the opening brace and the first space, and
type everything outside the fields:
{ IF "" = "" "" " " }
NB, you must have a space either side of the = sign.
3. Then put the insertion point inside the first "" and use crtl-F9 again:
{ IF "{  }" = "" "" " " }
4. Put the insertion point inside the new {  } and type MERGEFIELD Title:
{ IF "{ MERGEFIELD Title }" = "" "" " " }
5. repeat (3) and (4) to insert the second MERGEFIELD field:
{ IF "{ MERGEFIELD Title }" = "" "" "{ MERGEFIELD Title } " }

As an alternative to (3),(4),(5), you can put the insertion point where you
want the field to go and use the appropriate button on the merge toolbar to
insert the MERGEFIELD fields. You may find that you need to use Alt-F9 to
get back to the field code view to insert the next merge field.

If that isn't what you needed to know, let us know where you're getting
stuck.

Peter Jamieson