Here's the step by step:
1. Open a layout plan
   
2. Follow the sequence, to click Annotate -> Dimension -> Linear
3. Click the small arrow (Bottom right corner) for dimension style.
   
4. Choose "ISO-25", click "New" in Dimension style manager
   
5. Input the new style name, and click continue
   
6. Important here, input the text size first (the typical text size in your drawing), in order to avoid some confused in coming setting and preview.
       
7. Set “Precision” to 0 in the Primary Units
       
8. For the “Extend beyond dim lines”, input 70 (roughly 50% of text height); and “Offset from origin”, input 70 (roughly 50% of text height)
       
9. Set Arrowheads symbol and arrow size 100 (nearly the text size)
And then finally click okay.
       
10. Click close.
   
11. Make Dimension in drawing
a)Select the style “New ISO-25”
b)Select “linear” to draw a dimension 4300
   
c)After the first dimension 2420 completed, then to click “Continue”, draw a dimension continued from the previous dimension:
   

Done

A file browser interface will appear after you successfully log into your Figma account using a web browser.
The file browser interface for the most recent version of Figma is divided into two sections:
1. Side bar on the left
2. Files section
   

Left side bar:

• User name icon:
  
• This shows the current user's name. Clicking on it allows you to modify the user interface theme, settings, download the Figma desktop app, create a community profile, add or switch registered accounts, and log out of your account.
  
• The bell icon:
  
• Notifications about everything that occurs on your account will show up here.
  
• Search for anything box
  
• Recents
  
• XXX's team
  
• Drafts
  
• All projects
  
• Trash
  
• Starred/Team project
  
• Explore Community
  

• New design file
  
• You can create your own Figma designs
  
• New FigJamboard
  
• Digital whiteboards are utilized for online workshops and meetings, ......
  
• New slide deck
  
• And Import
  

Using shortcuts could help increase productivity during the design process by completing tasks more quickly.

There are two methods listed below to open the shortcuts panel and view the shortcuts list:

1. to press on the keyboard: control + shift +?
   

2. or to click the question mark (?) located at the bottom right of the user interface.
   

Easy!

Typical steps you'll need to make a new Figma design file:

1. Select "Recents."
2. Select the "New design file." 

   

3. Following that, a file interface for design work will appear.

   

The simple steps to log into Figma are listed below:

Once you're online and enter the URL figma.com, you can begin using the web-based application platform that Figma provided (of course, you can also download the Figma destop app to use it).

1. To log in, click "Get Started for free."
   

2. You can register using your other owned email or log in with your current Gmail account.
   

3. After that, a file browser interface will appear.
   

Done!