Hi Susan - unsure if you mean how to apply via business e-services or in general
HM Land Registry portal: login and guides - GOV.UK helps with the former
Our guidance is limited to PG 25 re the latter and how you can apply to register the lease as appropriate
Practice guide 25: leases - when to register - GOV.UK
The forms then include explanatory notes to assist with their completion and submission
If you have read the guidance/forms and can't make head nor tail of it then I would recommend that you seek professional assistance from a conveyancer
