How to use the "browser" to dynamically update host's IP?

Please substitute appropriate values for host, domain, password and  IP. The IP address parameter is optional.

https://dynamicdns.park-your-domain.com/update?host=[host_name]&domain=[domain.com]&password=[domain_password]&ip=[your_ip]

NOTE: Please ensure to use your Dynamic DNS password. Do not use your NameCheap account password.

Suppose if you want to update IP address at sub-domain level (subdomain.example.com) then you should specify the following details:

host = subdomain
domain = example.com
password = Go to Modify Domain page, select the domain and click on 'Dynamic DNS' on the left pane, when you enable Dynamic DNS for the domain , you receive this password .
ip = Optional. If you don't specify any IP, the IP from which you are accessing this URL will be set for the domain.

Example:

https://dynamicdns.park-your-domain.com/update?host=subdomain&domain=example.com&password=e747d77054a844409c486973cb&ip=127.0.0.1

NOTE:
 To dynamically update the domain itself (example.com), use @ in the host parameter (host = @). To dynamically update www.example.com, use www in the host parameter (host = www).

TIP: If you don't want to use any DNS client, you can just bookmark the URL (after substituting proper values) and access it whenever you need to update your IP.