Hi s1173 and welcome to the forum
If you mean a Debt Management Plan, you need to contact a company who specialises in these types of arrangement. Some will charge for their services, others appear to do them free of charge - so do shop around.
There is also nothing to stop you trying to offer a settelement to them directly at no cost at all. Work out what your disposable income is - by deducting your normal household and personal expenditure from your salary and any other income, and then divide this up into payments for each creditor pro-rata to the amount that you owe them.
I have to say, hwoever, that is it the arrangements which are managed externally which seem to have more credibility with creditors.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk