My toilet was broken and leaking before, but after I changed it, the circle always rang and squeaked

You've changed it. So don't worry too much about it. Labor costs now. >>>More

Maybe you go to your local community forum and post an inquiry, maybe you can get a better answer. At least a repairman outside of your city's borough won't be able to fix it for you.

"If there is a leak in the toilet, first scrape off the glass sealant at the contact part between the toilet base and the ground. Lift the toilet bowl and tilt it at a certain angle to check whether the sealing ring on the toilet drain is damaged or not tightly sealed. >>>More

If the inlet valve is loose, it is the pipe and float at the inlet that can be replaced all for only a few dozen yuan.

Is it a floor tile? If so, there is no other way, it is recommended to shake the toilet down and replace it. There are those who sell sealants, just squeeze around it, and you can sit in prison.