Connection string in VB.NET

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VB

SQL-Server-2014

Hi! I have a problem with my queuing system. Whenever other computers, other than the server, runs the program, it displays an error "...error 26 - Error locating server/instance specified." I don't have any idea how other computers can't find the server. Is my connection string wrong? Thanks for the help!

I'm currently using VS2012 and SQL Server 2014 as my server.
Below is my connection string code block:

What I have tried:

Try
           Dim sqlconn As New SqlConnection
           Dim sqlquery As New SqlCommand
           Dim connString As String
           connString = "Server=MISKRISTIAN-PC\HMO_OPD;Database=HMO_OPD_QUEUE;Trusted_Connection=True;"
           sqlconn.ConnectionString = connString
           sqlquery.Connection = sqlconn
           sqlconn.Open()
           sqlquery.CommandText = "INSERT INTO Retlane([Number],[Tick_Date],[Tick_Time])VALUES(@Number, @Tick_Date,@Tick_Time)"
           sqlquery.Parameters.AddWithValue("@Number", NumRet.Text)
           sqlquery.Parameters.AddWithValue("@Tick_Date", Queue.Label3.Text)
           sqlquery.Parameters.AddWithValue("@Tick_Time", Queue.Label21.Text)
           sqlquery.ExecuteNonQuery()
           sqlconn.Close()
       Catch ex As Exception
           MessageBox.Show(ex.Message)
       End Try