Help for bed

Hello can anybody help me ? We on benefits and I need try get a king size electric bed for husband more but I got grant form of ms trust not sure how to do it plus anybody else no we’re can apply? The district nurse got us a pressure mattress to go on top of are mattress but it to high so had take it of again plus husband doesn’t want us have sleep separate as they only offered get him a single bed so any help appreciated thanks