How to remove Unsecure warning for self signed certificate

FYI we were develop internal network application then put it on Tomcat server.Since we are using https, we created self signed certificate using this command,

keytool -genkey -keyalg RSA -noprompt -alias tomcat -dname "CN=bell-id.com, OU=NA, O=NA, L=NA, S=NA, C=NA" -keystore keystore.jks -validity 9999 -storepass changeme -keypass changeme

then put it on server.xml of tomcat conf.

<Connector     protocol="HTTP/1.1"    port="443" maxThreads="200"    scheme="https" secure="true" SSLEnabled="true"    keystoreFile="conf\keystore.jks" keystorePass="changeme"    clientAuth="false" sslProtocol="TLS" />

Ok, it's already working. btw we already setup DNS server so we can access it in our client website like this.

the url about like that, sorry I modify a bit,

https://rm-apps.bell-id.com/jw/web/login

this is for internal use.FYI I open it on latest Edge.

Then I click Not Secure warning, export the certificate to,

single certificate, *.p7c file.Then import on Edge manage certificate settings, put it on "Trusted Root Certification Authorities" then status is OK.

Then I refresh the Edge browsers.voila, nothing happened, still "Not Secure"

How can I remove this "Not Secure" warning?