BIP125 is the standard way to signal: https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki

Should explain everything you need.

On Thu, Jan 12, 2017 at 9:02 AM, Police Terror via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
Hello,

Where can I find the rules on transaction replacement?

For instance what are the valid ranges for the sequence values in
transaction inputs? Normally I set this value to MAX_UINT32, and the
locktime to 0.

Can I change the outputs? Can I add more inputs to pay a higher fee?

Just looking for clarity on this aspect of Bitcoin. Any resources would
be much appreciated.

Thanks.
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