Just add it into the top up opening.
It may / not work depending on why the system is leaking…given the system is “pressurised” and has a large number of seals & gaskets.
I’d start looking for a good used rack really…but watch for Fleabay type cowboys etc. You can get a decent one for less than 50 quid.
I paid £220,00 recently out of choice but that was a fully rebuilt & G’teed source.
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