I've just had a look at the D80e from the court website - and I think you must be using an out-of-date version, because the currrent form does not ask you to specify HOW your husband has signed - but simply to say that you identify the signataure as his.
Here's the link:-
It's the section on the last page which states:
"I identify the signature appearing in paragraph 10(a) of the acknowledgment of service, a copy of which I have attached to this statement and marked ‘A’, as the signature of my spouse civil partner, who is the Respondent in these proceedings"
so you tick the box to the left of this statement, tick spouse, complete the rest of the form, and staple a copy of the acknowledgement of service signed by your husband to the form , with a big "A" written by you at the top of the first page of the acknowledgement of service form.
Then to apply for your decree nisi, you also need to complete the application form for the decree nisi D84.
Here's the link:
Then make a complete copy of both for your onw records, and then hand in the orginals to the court office.
It may take a week or so for the papers to be considered by the district judge, but then you will hear from the court with a date for the decree nisi (you don't have to be at court for that ). 6 weeks and 1 day after the decree nisi has been pronounced, you can apply for the decree absolute.
I hope this helps and I wish you the best of luck.
Thanks and best wishes...