Download MathWallet extension wallet:
https://mathwallet.org/en-us/#extension
Create Nervos Extension Wallet
After completing the extension wallet initialization，“Switch Network” to “Nervos”
Click + button，create or import a wallet
Develop Nervos DAPP
Run a local Nervos node:
https://docs.nervos.org/getting-started/run-node.html
According to Nervos official JS SDK to develop a page to interact with Nervos:
https://docs.nervos.org/tooling/ckb-sdk-js.html
See the following document for the part related to the interaction with the extension (obtaining the current extension wallet, initiating the signature, etc.)
Check more Nervos DAPP
You can find more Nervos DAPPs in MathDappStore:
https://mathdapp.store/?blockchain=nervos