You can set “post name” as permalink from the wordpress back end and then save.
If you want same five grid row then you have to edit css file. In this (https://www.tnmartistry.com/wp-content/themes/virtue/assets/css/virtue.css) file you have to reduce right margin. Please refer the screen shot. (https://prnt.sc/l6khxa)
The font that you have used is font awesome 4.7.0 version. You need to replaced the font awesome old version css to new version(5.4.1) css. You can call font awesome CDN from here (https://fontawesome.com/how-to-use/on-the-web/setup/getting-started?using=web-fonts-with-css) . Please refer the screenshot (https://prnt.sc/l5ulhe). Also you can increase font size from “style.css” to get it bigger.
